Class 8 Probability — practice questions with answers

Data Handling · 5 sample questions from the school syllabus. Try each one, then open the answer and the worked solution.

1. A coin is tossed once. What is the probability of getting a head?

A $\frac{1}{2}$
B1
C0
D $\frac{1}{4}$

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Answer: A)

\frac{1}{2}

There are 2 equally likely outcomes (Head, Tail). Favourable = 1 (Head). P =

\frac{1}{2}

2. A bag contains 4 green, 5 yellow and 1 white marble. One marble is drawn. What is the probability it is yellow?

A $\frac{1}{2}$
B $\frac{5}{9}$
C $\frac{4}{10}$
D $\frac{1}{10}$

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Answer: A)

\frac{1}{2}

Total = 4 + 5 + 1 = 10. Yellow = 5. P =

\frac{5}{10} = \frac{1}{2}

3. Two coins are tossed once. What is the probability of getting at least one tail?

A $\frac{3}{4}$
B $\frac{1}{4}$
C $\frac{1}{2}$
D $\frac{1}{3}$

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Answer: A)

\frac{3}{4}

Outcomes: HH, HT, TH, TT. At least one tail = HT, TH, TT = 3. P =

\frac{3}{4}

4. A wheel of fortune at a Diwali mela has 20 equal slots numbered 1 to 20.
What is the probability that the wheel stops on a number that is a multiple of 5?

A $\frac{1}{5}$
B $\frac{1}{4}$
C $\frac{1}{10}$
D $\frac{3}{20}$

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Answer: A)

\frac{1}{5}

Multiples of 5 from 1 to 20: {5,10,15,20} = 4. P =

\frac{4}{20} = \frac{1}{5}

5. In a school garden survey, 300 plants were recorded: 90 roses, 75 marigolds, 60 jasmine and the rest tulsi.
A plant is chosen at random.
What is the probability that it is either a rose or a tulsi?

A $\frac{55}{100}$
B $\frac{1}{2}$
C $\frac{3}{10}$
D $\frac{9}{20}$

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Answer: A)

\frac{55}{100}

Tulsi = 300 - 90 - 75 - 60 = 75. Rose or tulsi = 90 + 75 = 165. P =

\frac{165}{300} = \frac{55}{100}

\frac{11}{20}

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